Roberto Cantoral García (7 June 1935 – 7 August 2010) was a Mexican composer, singer and songwriter. He was known for composing a string of hit Mexican songs, including "El Triste", "Al Final", "La Ba
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ca938bb8d7bd668c285afdba99858ec3dc31bcaef1582d1aaf12966b388288. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc595a8d-1117-417d-befd-1385c06ecc74.json and https://artists.proofprofile.net/proofs/artist/fc595a8d-1117-417d-befd-1385c06ecc74.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaebbae321c7ebf7939c54fcb3dc612be5bd520a687881702251b76e3df17edc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME1308549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96700548430b406a6191497057c81771d5b8454fda7fc63d1a352c7b8360dc61. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME1308550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710d477c964126a04d6aa8a274c2bd6e7eaa0905d581fbfe960078e793d2335a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME1308551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f07cdfd8b0f29d71432892b781380950bf91c26911aa07dbd946fccfeec5185. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME1308559.
Peerless 80 Aniversario - 24 Inolvidables
Regálame Esta Noche, Homenaje a Roberto Cantoral
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5d3493e5d4665ae9cf252c83dc417793c446011f7b4936e2824af613a39d14. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXA0N2500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf329153e1ab504ced06cb253a130c5b0c55d7dc7c0e3f4bab72090613837ef1f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:40:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MXA0N2500054.
Lo Mejor de los Mejores - Tríos del Mundo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd146f3e548e67ca73cf3bc526ec924d9a3800995c20a3a4d1a63fb917eed672. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USR011012709.
Plácido Domingo - The Latin Album Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bfee1424d360d9c1fcf67d7c0ea7bdb36c073cd9db47231a0555773eb17984. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b19a7c420cb8fbaf63a2a460163e3f022242f9489e50dfd30168d9ee66c455. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBL10000640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b19a7c420cb8fbaf63a2a460163e3f022242f9489e50dfd30168d9ee66c455. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-21T17:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBL10000640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99121c1424f98b3dd7465080ee63e64abd0a0d7ccfcd29de887467f8c607a7af. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1967801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357130890620d34b3de29155736e4b3cb993ff47f389d7fb452fc11200eda053. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USR011012693.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeada086971009a5324755a1fcf21cc21d2ffe98c1d9d10f93a3b512677600a2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USR011012698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9916aa4dccd4fa08856893720f629b651ae80fe74eba45afd571f258aef401e4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USRMK1300202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac5ec491b078857dd20d82f577641a91ef01efc0f0b9bb33c05eb39e782e27b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1967800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa54206e4841daec7176e0fc41cb357b71744a68cb8d5bbe407433d72e7fa54b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961000340.